This is the 8474th most frequent Spanish word.
reillo
"Reillo" does not appear to be a standard Spanish word. It may be a misspelling or regional slang.
Here, 'reillo' refers to a small, specific item or component of an object, used in a metaphorical sense to depict something minor and possibly crucial.
No encuentro el reillo de la lámpara.
I can't find the lamp's small tool.
In this sentence, 'reillo' is describing a delicate, protruding part of an item that has been damaged.
Se dobló el reillo con el golpe.
The small handle bent with the impact.
Here, 'reillo' is the noun used generically to emphasize the importance of a small component in operational integrity.